CCD Imaging of Variable Stars Kimberly Anderson Joshua Smith December 3, 2002

Outline Significance of Variable Star research Process of data collection and submission Example of data that we submitted

What are Variable Stars? Vary in intensity Two types:  Intrinsic: internal changes  Extrinsic: external effects

American Association of Variable Star Observers (AAVSO) Consists of independent observers, gathering and submitting data Analyzing data of variable stars creates better understanding of astronomical phenomena

Capturing Variable Star Image Attach CCD camera Focus Capture image, check with star chart Determine best exposure time

Analysis of CCD Image Adjust brightness Identify variable star Find relative magnitude Cross check magnitude using second star Submit data with observation time (Julian date)

Light Curve Example: U Aur

Light Curve Example: VW Hyi

Weblog Used weblog to journal progress, thoughts and reactions Available at:

Conclusion Disappointed that we were only able to make observations once Learned the significance of variable stars and some possibilities in astronomy using computer technology